Toro Groundsmaster 3280-D Service Manual page 210

Disassembling the Steering Cylinder (4-Wheel Drive) (continued)
Inspecting the Steering Cylinder
Assembling the Steering Cylinder (4-Wheel Drive)
Hydraulic System: Service and Repairs
5. Mount the shaft in a vise. Remove the locknut and piston from the shaft.
Carefully slide the head and internal collar off the shaft.
6. Remove and discard the U-ring (item 12 in
piston. Remove and discard the dust seal, back-up washer, O-ring, and
rod seal from the head.
Use eye protection such as goggles when using compressed air.
1. Wash all the cylinder components in clean solvent and dry them with
compressed air.
2. Inspect the internal surface of the barrel for deep scratches, out-of-roundness,
and bending.
3. Inspect the head, shaft, and piston for excessive pitting, scoring, and wear.
4. Replace the steering cylinder if the internal components are worn or
damaged.
1. Use a new seal kit and replace the dust seal, U-ring, back-up washer, rod
seal, and all O-rings to the piston and head. Apply clean hydraulic fluid to all
the seal kit components before you install them.
Clamping the vise jaws against the shaft surface could damage the
shaft. When securing the shaft in a vise, protect the shaft surface.
2. Mount the shaft securely in a vise.
Note: Do not damage the rod seal and dust seal during installation.
3. Coat the shaft lightly with clean hydraulic fluid. Slide the internal collar and
head onto the shaft.
Note: Do not damage the O-ring during installation.
4. Install the piston onto the shaft. Install the locknut onto the shaft and tighten
the locknut.
5. Remove the shaft from the vise.
When clamping the cylinder's barrel in a vise; clamp on the pivot end
only to prevent damage. Do not close the vise on the barrel.
6. Mount the steering cylinder barrel in a vise equipped with soft jaws by
clamping on the barrel so that the shaft end tilts up slightly.
7. Coat all the internal cylinder components with clean hydraulic fluid. Slide the
piston, shaft, and head assembly into the barrel.
8. Use a spanner wrench, secure the head in barrel with the internal collar.
CAUTION
IMPORTANT
IMPORTANT
Page 5–126
Figure 101) and O-ring from the
Groundsmaster
05138SL Rev B
® 3280-D/3320